12.4-(0.39+24) 简便方法
问题描述:
12.4-(0.39+24) 简便方法
答
12.4-(0.39+2.4)
=12.4-2.4-0.39
=10-0.39
=9.61是2412.4-(0.39+24)=12.4-0.4-24+0.01=12-24+0.01= -12+0.01= -11.99